/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingComponents/Public/ModelingObjectsCreationAPI.h
Generate a N-letter GUID string that contains only hex digits, and contains at least one letter and one number. Used to create _UUID suffixes for making asset names unique, etc.
namespace UE { namespace Modeling { [FString](API\Runtime\Core\Containers\FString) UE::Modeling::GenerateRandomShortHexString ( int32 NumChars ) } }